“I didn’t read it,” Yuna said, a small, knowing smirk playing on her lips. “But you might want to hide it better if you don’t want me to know what you’re really thinking.”
"Bad Thinking Diary" is a popular South Korean yuri manhwa by Park Do-han and Rangrat, detailing the intense, often toxic transition from a lifelong friendship to a romantic obsession between protagonists Kim Min-ji and Kang Yu-na. The psychological drama is noted for its high-quality art and explores complex themes of insecurity and jealousy, featuring a manipulative side character named Hye-ra. Read more details about the character of Kang Yu-na on the LGBT Characters Wikia . Reviews - Bad Thinking Diary | The StoryGraph Bad Thinking Diary